I have created an event for when the user selects the TxManipulation but I cannot find the event to get the actual TxManipulatorElementData that is select.

Answer:

You can use TxPickListener class to register to the Picked event. Then from the TxPickListener_PickedEventArgs event arguments you can take the ElementIndex. It will return you the index of the picked element in the manipulator.

Note: When you create the elements of the manipulator, set the Pickable property of the element data to true. Also when you create the TxPickListener, set its IgnorPickOfTransientObjects property to false.

Then register to the Picked and Deactivated events. In the Deactivated event handler unregister from both events: